JP2006215365A - Projection system and projection adjustment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection system or the like which secures a degree of freedom in installing a projector, which has a suitable shape, and which efficiently provides a projection image having an appropriate size. <P>SOLUTION: The projector includes: a positional information generator 152 for generating positional information 146 on the basis of sensing information 144 from sensing parts 50-1, 50-2, and 50-3; an angular information generator 154 for generating angular information 148; and an adjustment processor 156 for executing the adjustment processing on the basis of the positional information 146 and the angular information 148 so that an image is displayed in a desired state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projection system and a projection adjustment method for executing an adjustment process for projecting a desired image based on sensing information.

  Patent Document 1 describes a projection system in which a projector and a screen are integrated via an arm.

  The projection system includes a projector that magnifies and projects image light formed by an image display element using a projection lens, a screen that displays image light projected by the projector, and a connection arm unit that connects the projector and the screen. Yes.

  Also, this projection system uses the projector with the connection arm portion extended when in use, and retracts the connection arm portion when not in use to store the projector.

  According to such a configuration, the projector can uniquely fix the relative positional relationship between the projector and the screen when projecting an image. Thus, since the projector can determine the positional relationship in advance, a desired image can be projected on the screen without inputting data on the positional relationship between the image projected on the screen each time it is used. it can.

  Further, in Patent Document 2, a digital camera provided in a projector images four corner markers of a rectangular area provided at a projected projection position on a screen, and corrects image data based on imaging information. A projection system for correcting trapezoidal distortion of a projected image is described.

  Patent Document 3 describes a screen that corrects trapezoidal distortion of a projected image by providing photodiodes on each of the four sides of the screen and controlling the attitude of the screen based on the output value of the photodiode.

As in Patent Documents 2 and 3, in the conventional system, a detecting means such as a light amount is provided on one of the projector side and the screen side.
JP 2003-330108 A JP 2004-274283 A JP 2004-78167 A

  However, in the case of the technique disclosed in Patent Document 1, it is impossible to move if there are obstacles in the movement path of the arm unit and the projector, and if there are obstacles in the projection optical path, an appropriate image cannot be projected.

  For this reason, this projection system lacks the freedom of installation. In particular, when the projector is configured to be attached to the lower part of the screen or the like via an arm so that the projector can be moved within reach, an obstacle can be used instead of manually storing the projector. It will be in the state which is easy to be influenced by. Therefore, it is important to secure the degree of freedom of installation.

  In the case of the method of Patent Document 2, it is necessary to change the position of the marker in order to change the position and size of the rectangular area to be projected, which is troublesome for the user. In addition, since it is necessary to acquire information about the positions of the four corners of the projected image in order to change the position and size of the rectangular area to be projected, the projected image is displayed when the position of the projector is moved while projecting a desired image. Therefore, the projection of a desired image must be interrupted.

  In the case of the method of Patent Document 3, the relative angle between the projector and the screen is determined, so that the distortion of the image can be changed, but the relative position between the projector and the screen cannot be determined. The size cannot be determined and cannot be changed in consideration of the size of the projected image.

  The present invention has been made in view of the above problems, and an object of the present invention is to ensure a degree of freedom of installation of the projector, to obtain a projection image having an appropriate shape and an appropriate size efficiently. It is an object of the present invention to provide a projection system and a projection adjustment method that can be used.

In order to solve the above problems, a projection system according to the present invention includes a projector that projects an image,
A target portion on which the image projected by the projector is displayed;
A projection system comprising:
The projector or the target unit is
Angle deriving means for deriving a predetermined angle;
Position information generating means for generating position information indicating information on a relative position between the projector and the target unit;
Angle information generating means for generating angle information indicating information on a relative angle between the projector and the target unit;
Based on the position information and the angle information, adjustment of at least one of a correction process of image information used for projecting the image and a control process of a projection unit included in the projector so that the image is displayed in a desired state Adjustment processing means for executing processing;
Including
One of the projector and the target unit is
A first sensing means;
A first marker part, a second marker part provided at a position different from the first marker part,
Have
The other of the projector and the target unit is
A third sign section;
A second sensing means;
Have
The first sensing means generates first sensing information by sensing the vicinity of the third marker,
The second sensing means generates second sensing information by sensing the vicinity of the first marker,
The second sensing means generates third sensing information by sensing the vicinity of the second marker part,
The angle deriving means includes
Based on the first sensing information, a first angle that is a relative angle between the third marker and the first sensing means is derived,
Based on the second sensing information, a second angle that is a relative angle between the first marker and the second sensing means is derived,
Based on the third sensing information, a third angle that is a relative angle between the second marker and the second sensing means is derived,
The position information generating means generates the position information using at least the first to third angles,
The angle information generating means generates the angle information using at least the first to third angles,
The position information and the angle information are information defined in a predetermined plane.

Further, in the projection system, the position information generation unit generates the position information based on the first to third angles using a circumscribed circle sine theorem in contact with the first to third marker portions. ,
The angle information generation unit generates the angle information by deriving an angle formed by an optical axis of the second sensing unit and a normal line of the target unit based on the first to third angles. May be.

A projection adjustment method according to the present invention includes a projector that projects an image,
A target portion on which the image projected by the projector is displayed;
A projection adjustment method for a projection system comprising:
One of the projector and the target unit is
A first sensing means;
A first marker part, a second marker part provided at a position different from the first marker part,
Have
The other of the projector and the target unit is
A third sign section;
A second sensing means;
Have
First sensing information is generated by sensing the vicinity of the third marker using the first sensing means,
Second sensing information is generated by sensing the vicinity of the first marker using the second sensing means,
Third sensing information is generated by sensing the vicinity of the second marker using the second sensing means,
Based on the first sensing information, a first angle that is a relative angle between the third marker and the first sensing means is derived,
Based on the second sensing information, a second angle that is a relative angle between the first marker and the second sensing means is derived,
Based on the third sensing information, a third angle that is a relative angle between the second marker and the second sensing means is derived,
Based on the first to third angles, the sine theorem of the circumscribed circle in contact with the first to third marker portions is used to indicate information on the relative position between the projector and the target portion, and within a predetermined plane Generate location information specified in
Based on the first to third angles, a relative angle between the projector and the target unit is derived by deriving an angle between the optical axis of the second sensing unit and the normal line of the target unit. Indicating information, generating angle information defined in the predetermined plane,
Based on the position information and the angle information, adjustment of at least one of a correction process of image information used for projecting the image and a control process of a projection unit included in the projector so that the image is displayed in a desired state A process is executed.

  According to the present invention, the projection system or the like discriminates the relative position and angle between the projector and the target unit by sensing each marker unit, and an image is displayed in a desired state according to the discrimination result. Thus, since the image information can be corrected, the projector can be installed at a position other than the position facing the target portion.

  Further, according to the present invention, the projection system and the like can perform image distortion correction and the like without providing markers or the like at the projection area or the four corners or four sides of the screen, so that it is possible to reduce labor for the user.

  Therefore, according to the present invention, the projection system or the like can ensure the degree of freedom of installation of the projector, and can efficiently obtain a projection image having an appropriate shape and an appropriate size.

In the projection system and the projection adjustment method, the marker unit emits light by light projection or reflection,
The angle deriving unit may derive the first to third angles based on luminance information and sensing angles included in the first to third sensing information.

  Accordingly, the projection system or the like can determine the relative position and angle between the projector and the target unit based on the luminance information.

  Further, the projection system and the projection adjustment method may include a support unit that supports the projector and the target unit so that the position information and the angle information are defined within the predetermined plane. .

  According to this, since the projection system or the like only needs to determine the planar positional relationship, the relative position and angle between the projector and the target unit are more efficiently compared to the case of determining the stereoscopic positional relationship. Can be determined.

  The projection system and the projection adjustment method may include an arm portion formed so that a relative position between the projector and the target portion can be changed by an expansion / contraction operation or a rotation operation.

  According to this, since the projection system or the like can change the relative position between the projector and the target portion by an expansion / contraction operation or a rotation operation, the usability for the user can be improved.

In the projection system and the projection adjustment method, the projection unit includes a lens shift unit that adjusts the projection position of the image, a zoom unit that adjusts the size of the image, and a focus unit that adjusts the focal position of the image. Including at least one of
The adjustment processing unit may control at least one of the lens shift unit, the zoom unit, and the focus unit as the control processing so that the image is displayed in a desired state.

  According to this, the projection system can project an image in a desired state by controlling at least one of the lens shift unit, the zoom unit, and the focus unit.

In the projection system and the projection adjustment method, the projection unit includes a spatial light modulator,
The adjustment processing means includes a process of changing an image area in the spatial light modulator and a process of changing a modulation amount in the spatial light modulator as the control process so that the image is displayed in a desired state. At least one of the processes may be executed.

  According to this, the projection system can project an image in a desired state by controlling the spatial light modulator.

  Hereinafter, a case where the present invention is applied to a projection system having a projector will be described as an example with reference to the drawings. In addition, the Example shown below does not limit the content of the invention described in the claim at all. In addition, all of the configurations shown in the following embodiments are not necessarily essential as means for solving the problems described in the claims.

(First embodiment)
FIG. 1 is a perspective view of a projection system in the first embodiment. FIG. 2 is a plan view of the projection system in the first embodiment. FIG. 3 is a side view of the projection system in the first embodiment. FIG. 4 is a front view of the projection system in the first embodiment.

  The projection system includes a projector 20 that projects an image on a screen 10, a screen 10 that is a kind of target unit that displays a projection image 12 projected by the projector 20, an arm unit 30 that connects the projector 20 and the screen 10. It is comprised including.

  The arm unit 30 includes three movable units 32-1 to 32-3 formed to be capable of rotating to change the relative positional relationship between the projector 20 and the screen 10, an arm 34-1, 34-2. More specifically, the movable part 32-1 is provided at the lower part of the screen 10, is connected to the arm 34-1 and supports the screen 10 or the arm 34-1 so as to be rotationally driven. Moreover, the movable part 32-2 connects the arms 34-1 and 34-2, and supports the arms 34-1 and 34-2 so as to be rotationally driven. Moreover, the movable part 32-1 is provided in the lower part of the projector 20, is connected to the arm 34-2, and supports the projector 20 or the arm 34-2 so as to be rotationally driven. In addition, the rotational axis of the movable parts 32-1 to 32-3 in the present embodiment is parallel to the Y axis described later, and the movable parts 32-1 to 32-3 can rotate in the horizontal direction.

  Further, the screen 10 according to the present embodiment has a sign unit 40-1 at the lower left end of the projection target area, a sensing unit 50-1 at the lower center of the projection target area, and a sign at the lower right end of the projection target area. Part 40-2. In addition, the projector 20 in the present embodiment includes a marker unit 40-3 and a sensing unit 50-2 below. The arm unit 30 functions as a support unit that instructs the screen 10 and the projector 20 so that the marking units 40-1 to 40-3 and the sensing units 50-1 and 50-2 are arranged on the same plane. Furthermore, sensing information from the sensing unit 50 is input to the projector 20 via a cable provided inside the arm unit 30.

  1 and 4, the projected image 12 has a rectangular shape. However, as shown in FIG. 2, since the projector 20 projects from an oblique position with respect to the screen 10, the projected image is actually projected. 12 is in a distorted state and is not in a desired state.

  In order to bring the projected image 12 into a desired state, in the present embodiment, the projector 20 forms between each of the marker units 40 and each of the sensing units 50 based on the sensing information of the marker unit 40 by the sensing units 50-1 and 50-2. By determining the angle, the relative position and angle between the projector 20 and the screen 10 are determined.

  Further, the projector 20 determines the position and shape of the projection image 12 based on the determined relative position and angle, and performs distortion correction processing of the projection image 12 so that the projection image 12 is displayed in a desired state. Execute the adjustment process.

  Next, functional blocks of the projector 20 for implementing such functions will be described.

  FIG. 5 is a diagram illustrating an example of functional blocks of the projector 20.

  The projector 20 includes a sensing unit 50-1 to 50-3, an image information input unit 110 that inputs image information from a PC or the like and performs A / D conversion, and a calibration that generates image information for a calibration image. An information generation unit 120, an image information output unit 130 that performs D / A conversion, a storage unit 140, a processing unit 150 that executes adjustment processing, and an input / output unit that inputs sensing information and the like from the sensing unit 50 160 and a projection unit 190 for inputting image information from the image information output unit 130.

  The storage unit 140 stores length information 142, sensing information 144 from each sensing unit 50, position information 146, angle information 148, and the like.

  In addition, the processing unit 150 includes a position information generation unit 152 that generates position information 144, an angle information generation unit 154 that generates angle information 146, an adjustment processing unit 156 that performs control processing of the spatial light modulator 191, and the like. , And an angle deriving unit 158 for deriving a predetermined angle based on the sensing information 144.

  The projection unit 190 includes a spatial light modulator 191, a projection lens 192 that projects projection light, a zoom unit 194 that adjusts the angle of view, a focus unit 196 having an autofocus function, and projection light in an arbitrary direction. And a lens shift unit 198 for projecting.

  For example, the following can be applied as hardware for implementing the functions of these units.

  FIG. 6 is a diagram illustrating an example of a hardware block of the projector 20.

  For example, the image information input unit 110 includes, for example, an A / D converter 930, an image processing circuit 970, the storage unit 140 includes, for example, a RAM 950 and a ROM 960, and the processing unit 150 includes, for example, an image processing circuit 970, For example, the CPU 910, the calibration information generation unit 120, for example, the image processing circuit 970, the RAM 950, etc., the image information output unit 130, for example, the D / A converter 940, etc., and the spatial light modulator 191, for example, a liquid crystal It can be mounted using the panel 500 or the like.

  Note that these units can exchange information with each other via the system bus 980.

  As the sensing unit 50, for example, a CCD sensor, a CMOS sensor, a line sensor, a single pixel sensor that can be driven to rotate in the horizontal direction, or the like may be employed. When the sensing unit 50 is rotationally driven, the adjustment processing unit 156 may generate control information, and the input / output unit 160 may output the control information to the sensing unit 50 to perform rotational drive control. Moreover, as the label | marker part 40, you may employ | adopt LED etc. which light-emit, the mirror which reflects light, etc., for example.

  Each of these units may be implemented in hardware like a circuit, or may be implemented in software like a driver.

  Furthermore, the function of the processing unit 150 or the like may be implemented in the computer by reading the program from the information storage medium 900 that stores the program for causing the computer to function as the processing unit 150 or the like.

  As such an information storage medium 900, for example, a CD-ROM, a DVD-ROM, a ROM, a RAM, an HDD, or the like can be applied, and the program reading method may be a contact method or a non-contact method. Good.

  Further, in place of the information storage medium 900, the functions described above can be implemented by downloading a program or the like for implementing the functions described above from a host device or the like via a transmission path.

  Next, a projection adjustment process using these units will be described.

  As a premise, in this embodiment, the coordinates of the center C of the screen 10 are (0, 0, 0), the position of the projector 20 is the coordinates of the center P of the exit pupil of the projection lens 192 (x, y, z). And The horizontal of the screen 10 is the X axis, the vertical is the Y axis, and the normal direction is the Z axis.

  Further, the relative position between the screen 10 and the projector 20 is expressed by the positional relationship between the coordinates (0, 0, 0) of the center C and the coordinates (x, y, z) of the center P of the exit pupil of the projection lens 192. To do.

  As shown in FIG. 3, a plane parallel to the ZX plane including the center of the exit pupil of the projection lens 192 is defined as a plane H1. The plane H1 is located at a distance Y1 from the center C in the −Y axis direction.

  In the present embodiment, each marker 40 and each sensing unit 50 are provided on a plane H2 that is a plane parallel to the ZX plane. The plane H2 is located at a distance of Y1 + Y2 from the center C in the −Y axis direction.

  As shown in FIG. 4, the sensing unit 50-1 is located at the intersection of the plane H <b> 2 and the plane H <b> 2 passing through the center C. Moreover, the label | marker parts 40-1 and 40-2 are each located in the place which separated X1 from the sensing part 50-1 on the straight line which XY plane and plane H2 cross | intersect.

  Moreover, the label | marker part 40-3 and the sensing part 50-2 are located so that it may overlap with the intersection of the perpendicular of the plane H2 which passes the center P, and the plane H2. In order to make the figure easier to understand, in FIG. 3 and the like, the labeling unit 40-3 and the sensing unit 50-2 do not overlap, but even if they do not overlap, the projector 20 shows the difference in position between the two. It is possible to process in the same manner as in the case of overlapping by calculating.

  Based on the above assumptions, X1, Y1, and Y2 are known values and are stored in the storage unit 140 as the length information 142.

  Further, based on the above assumptions, the relative position (x, y, z) between the screen 10 and the projector 20 is known because y is -Y1 and is known, and therefore x and z are determined. Further, the relative angles (θyz, θzx, θxy) between the screen 10 and the projector 20 are determined when θzx is obtained because θyz and θxy are 0. Note that θyz is a planar angle in the YZ plane, θzx is a planar angle in the ZX plane, and θxy is a planar angle in the XY plane.

  FIG. 7 is a flowchart of the projection adjustment process in the first embodiment. FIG. 8 is a schematic diagram showing the first angle. FIG. 9 is a graph showing the relationship between the sensing angle and the luminance value in the first sensing unit 50-1.

  In the present embodiment, the angle deriving unit 158 derives first to third angles to be described later based on the sensing information 144, and the position information generating unit 152 and the angle information generating unit 154 perform position information based on these angles. 146 and angle information 148 are generated.

  First, a procedure for deriving the first angle θ1 formed by the straight line T1 passing through the sensing unit 50-1 and the labeling unit 40-3 and the normal line of the sensing unit 50-1 will be described.

  The sensing unit 50-1, which is the first sensing means, senses the vicinity of the third marker unit 40-3 while rotating in the horizontal direction with the axis parallel to the Y axis as the rotation axis, thereby obtaining the luminance for each sensing angle. First sensing information indicating a value is generated (step S1). The angle deriving unit 158 stores the first sensing information as sensing information 144 in the image information output unit 140.

  Then, the angle deriving unit 158 determines the sensing angle (first angle) at which the luminance value becomes a peak based on the first sensing information included in the sensing information 144 (step S2). For example, as shown in FIG. 9, the luminance value has a peak at the sensing angle θ1.

  With the above procedure, the angle deriving unit 158 can derive the first angle θ1.

  FIG. 10 is a schematic diagram showing the second and third angles. FIG. 11 is a graph showing the relationship between the sensing angle and the luminance value in the second sensing unit 50-2.

  Next, the second angle θ2 formed by the straight line T2 that is the optical axis of the sensing unit 50-2, the straight line passing through the sensing unit 50-2 and the labeling unit 40-1, the straight line T2, and the sensing unit 50- A procedure for deriving the third angle θ3 formed by the line 2 and the straight line passing through the marker 40-2 will be described.

  The sensing unit 50-2, which is the second sensing means, is in the vicinity of the label unit 40-1 while rotating in the horizontal direction from the optical axis to the first label unit 40-1 with the axis parallel to the Y axis as the rotation axis. The second sensing information indicating the luminance value for each sensing angle is generated (step S3). The angle deriving unit 158 stores the second sensing information as sensing information 144 in the image information output unit 140.

  In addition, the sensing unit 50-2 senses the vicinity of the marker unit 40-2 while rotating in the horizontal direction from the optical axis to the second marker unit 40-2 with the axis parallel to the Y axis as the rotation axis. Then, the third sensing information indicating the luminance value for each sensing angle is generated (step S4). The angle deriving unit 158 stores the third sensing information as sensing information 144 in the image information output unit 140.

  Then, the angle deriving unit 158 determines the sensing angle (second angle) at which the luminance value has reached its peak based on the second sensing information included in the sensing information 144 (step S5). For example, as shown in FIG. 11, the luminance value has a peak at the sensing angle θ2.

  Further, the angle deriving unit 158 determines the sensing angle (third angle) at which the luminance value has reached a peak based on the third sensing information included in the sensing information 144 (step S6). For example, as shown in FIG. 11, the luminance value has a peak at the sensing angle θ3.

  Through the above procedure, the angle deriving unit 158 can derive the second angle θ2 and the third angle θ3.

  Next, a method for deriving the relative position between the projector 20 and the screen 10 will be described.

  FIG. 12 is a schematic diagram showing a method for deriving the relative position and angle between the projector 20 and the screen 10.

  The position information generation unit 152 generates position information based on the first to third angles (step S7). Hereinafter, a method for generating position information will be described.

  In the ZX plane of FIG. 8, the position of the sensing unit 50-1 is (X, Z) = (0,0), and the position of the labeling unit 40-3 is (X, Z) = (x, z). . Therefore, z = −tan (90 + θ1) x (Expression 1).

  In addition, in the ZX plane of FIG. 12, the radius R of the circumscribed circle of the three points of the labeling units 40-1 and 40-2 and the sensing unit 50-2 (labeling unit 40-3) is R = X1 / sin from the sine theorem. (Θ2−θ3) (Expression 2)

となる。
したがって、式２と式３より、

となる。
また、ｚ＞０であるため、式１と式４より、

となり、

となる。 Further, since the circumscribed circle is in contact with the position (X, Z) = (− X1, 0) of the label part 40-1 and the position (X, Z) = (X1, 0) of the sign part 40-2,

It becomes.
Therefore, from Equation 2 and Equation 3,

It becomes.
Since z> 0, from Equation 1 and Equation 4,

And

It becomes.

  Through the above procedure, the position information generating unit 152 uses the information indicating the relative position (x, y, z) of the sign unit 40-3 as the position information 146 indicating the relative position between the projector 20 and the screen 10. Can be generated as

  Further, the angle information generation unit 154 generates angle information based on the first to third angles (step S8). Hereinafter, a method for generating angle information will be described.

  As shown in FIG. 12, on the ZX plane, an angle formed by a straight line connecting the sensing unit 50-2 and the marking unit 40-2 and the screen 10 is θ4.

  In this case, since x <0, tan θ4 = z / (X1−x) (Expression 7).

From Equation 7, θ4 = tan ⁻¹ {z / (X1−x)} (Equation 8).

  In the triangle having the intersection of the optical axis of the sensing unit 50-2 and the screen 10, the labeling unit 40-2, and the sensing unit 50-1, the sum of the interior angles of the triangle is 180 degrees, as shown in FIG. , Θ3, and θzx are negative values, 90−θzx−θ3 + θ4 = 180 (Equation 9).

Therefore, from Expression 8 and Expression 9, θzx = −90−θ3 + tan ⁻¹ {z / (X1−x)} (Expression 10).

  Therefore, the angle information generation unit 154 can derive θzx by the above procedure, and can generate angle information 148 indicating information on the relative angle between the screen 10 and the screen 10.

  Then, the adjustment processing unit 156 determines the relative position and angle between the screen 10 and the projector 20 based on the position information 146 and the angle information 148, and corrects the image distortion so that the image is displayed in a desired state. The adjustment process is executed (step S9).

  As described above, according to the present embodiment, the projector 20 determines the relative position and angle between the projector 20 and the screen 10 by sensing the sign unit 40, and an image is desired according to the determination result. Since the image information can be corrected so as to be displayed in the above state, the projector 20 can be installed at a position other than the position facing the screen 10.

  Further, according to the present embodiment, the projection system can perform image distortion correction and the like without providing markers or the like at the four corners or four sides of the projection area or the screen 10, so that it is possible to reduce labor for the user.

  Therefore, according to the present embodiment, the projection system can secure the degree of freedom of installation of the projector 20 and can obtain a projection image 12 having an appropriate shape and an appropriate size.

  In addition, according to the present embodiment, the projector 20 only needs to determine the planar positional relationship, and therefore, the relative relationship between the projector 20 and the screen 10 can be more efficiently compared to the case of determining the stereoscopic positional relationship. The correct position and angle can be determined.

  In addition, according to the present embodiment, by providing the arm unit 30, the relative position between the projector 20 and the screen 10 can be changed by the expansion or contraction operation or the rotation operation of the arm unit 30, so that it is convenient for the user. Can be improved.

  Note that an adjustment processing method such as image distortion correction is arbitrary. For example, the adjustment processing unit 156 may execute the adjustment process in hardware by controlling at least one of the spatial light modulator 191, the lens shift unit 198, the zoom unit 194, and the focus unit 196. The adjustment processing unit 156 may execute the adjustment process in software by correcting the input image information.

(Second embodiment)
In the first embodiment, in order to simplify the explanation, the projector 20 derives x, z, and θzx as three degrees of freedom. However, even if the degrees of freedom (variables) other than these are included, The variable can be derived by the same procedure as described above.

  FIG. 13 is a side view of the projection system in the second embodiment.

  For example, as shown in FIG. 13, when the optical axis of the projector 20 is inclined by θzy with respect to the plane H1, θzy can be derived by an inclination sensor (for example, a potentiometer, a gravity sensor, etc.) built in the projector 20. The relative angles (θyz, θzx, θxy) between the projector 20 and the screen 10 can be derived.

(Third embodiment)
In the first embodiment, the projection system includes the arm unit 30, but may be configured without the arm unit 30.

  FIG. 14 is a side view of the projection system in the third embodiment.

  For example, as shown in FIG. 14, when the projector 20 and the screen 10 are arranged on a flat floor, the sign section 40 and the sensing section 50 are on the same plane, and the height of the center position P of the projection lens 192 is If the height of the center position C of the screen 10 can be defined, the projector 20 can derive the relative position and angle between the projector 20 and the screen 10 by the above-described procedure.

  That is, the position information and angle information derived from the sign unit 40 and the sensing unit 50 may be defined as information in a predetermined plane.

  If the arm unit 30 is not provided, the screen 10 and the projector 20 may be connected by a cable to transmit / receive sensing information or the like, or the screen 10 and the projector 20 may be provided with wireless communication means to sense information. Etc. may be transmitted and received wirelessly.

(Modification)
The preferred embodiments to which the present invention is applied have been described above, but the application of the present invention is not limited to the above embodiments.

  For example, in the above embodiment, the projector 20 has the position information generation unit 152 and the like. However, the screen 10 is provided with the position information generation unit 152 and the screen 10 generates position information and angle information, and control information. Or the projector 20 may execute adjustment processing based on position information from the screen 10 or the like.

  Further, the arrangement of the marking unit 40 and the sensing unit 50, the angle between the projector 20 and the screen 10, the reference point C and the point P, etc. are not limited to the above-described embodiments, and can be changed without departing from the spirit of the present invention. Is possible.

  In other words, even when the position of the sign section 40 or the like is in a position different from the above-described embodiment, the projector 20 or the like corrects the difference in position by calculation, and generates position information and angle information. What is necessary is just to be able to calculate equivalent to the calculation of the example. Similarly, even if the angle relating to the screen 10 is different from that in the above-described embodiment, the projector 20 or the like corrects the difference in angle by calculation and generates position information and angle information. It suffices if a calculation equivalent to the above calculation is possible.

  In the above-described embodiment, the projector 20 and the screen 10 include the sign unit 40 and the sensing unit 50. However, the sign unit 40 and the like are attached to the projector 20 via an object that can specify the physical positional relationship. If it is, it is the same as that the sign part 40 etc. are attached to the projector 20. For example, even if the sign unit 40 or the like is attached via the arm 34, the sign unit 40 or the like is attached to the projector 20 by calculation as long as the positional relationship of the sign unit 40 or the like can be specified as viewed from the projector 20. Therefore, it is considered that the sign portion 40 or the like is attached to the projector 20. Similarly, in the screen 10, if the sign portion 40 or the like is attached to the screen 10 via an object that can identify the physical positional relationship with the screen 10, it can be corrected as if it was attached to the screen 10 by calculation. Suppose that it is the same as that the label | marker part 40 grade | etc., Is attached to the screen 10. FIG.

  For example, the marking unit 40-3 and the sensing unit 50-2 may be provided on the screen 10, and the marking units 40-1, 40-2 and the sensing unit 50-1 may be provided on the projector 20.

  Moreover, in the said Example, although the label | marker part 40 is formed so that it may light-emit, the structure which reflects light may be sufficient and what has a color and brightness different from the circumference | surroundings should just be used.

  Moreover, in the said Example, although the frame of the screen 10 is black so that the marker parts 40-1 and 40-2 may be detected easily, a black board etc. are provided behind the marker part 40-3. Also good.

  Further, the arithmetic expression for obtaining the relative position and angle between the projector 20 and the screen 10 is not limited to the above-described example, and various modifications can be employed.

  Further, the processing procedure is not limited to the example shown in FIG. For example, each sensing unit 50 may sense at the same time.

  Further, as the screen 10, a reflective screen is used in the above embodiment, but a transmissive screen may be used. In addition to the screen 10, for example, a blackboard, a white board, or the like may be adopted as a target portion on which an image is projected.

  Further, the support portion is not limited to the arm portion 30, and various members that change the relative positions of the projector 20 and the screen 10 can be employed. Moreover, the arm part 30 is not limited to the said Example, You may perform an expansion-contraction operation | movement, and the number and shape of movable parts 32-1, etc., arms 34-1, etc. are arbitrary.

  Further, the projector 20 determines, based on the position information and the angle information, means for determining whether or not the projector 20 or the screen 10 is disposed at a position where a desired image cannot be projected only by adjustment processing, and determines that the desired image cannot be projected. It may have means for notifying the user when it is done. More specifically, for example, when the projector 20 determines that the image cannot be displayed in a desired state, the projector 20 notifies the user that the image cannot be displayed by outputting at least one of the image, sound, and light. The user may be notified using means.

  In the above embodiment, the projection system is used on the floor or the like. However, the screen 10 may be fixed to the wall or the like to support the projection system.

  For example, in the above-described embodiment, an example in which the liquid crystal projector is mounted on the projector 20 has been described. However, in addition to the liquid crystal projector, for example, a projector using a CRT (Cathode Ray Tube), DMD (Digital Micromirror Device), or the like is used. It may be used. DMD is a trademark of Texas Instruments Incorporated.

  Further, the projection unit 190 may have a configuration using a curved mirror.

  Further, the functions of the projector 20 described above may be implemented, for example, by a single projector, or may be implemented by being distributed by a plurality of processing devices (for example, distributed processing by a projector and a PC).

1 is a perspective view of a projection system in a first embodiment. It is a top view of the projection system in the 1st example. It is a side view of the projection system in the 1st example. It is a front view of the projection system in the 1st example. It is a figure which shows an example of the functional block of a projector. It is a figure which shows an example of the hardware block of a projector. It is a figure which shows the flowchart of the projection adjustment process in a 1st Example. It is a schematic diagram which shows a 1st angle. It is a graph which shows the relationship between the sensing angle and luminance value in a 1st sensing part. It is a schematic diagram which shows a 2nd and 3rd angle. It is a graph which shows the relationship between the sensing angle and luminance value in a 2nd sensing part. It is a schematic diagram which shows the method for deriving | releasing the relative position and angle of a projector and a screen. It is a side view of the projection system in the 2nd example. It is a side view of the projection system in a 3rd Example.

Explanation of symbols

  10 screens, 12 projected images, 20 projectors, 30 arm units, 32-1 to 32-3 movable units, 34-1, 34-2, 35-1, 35-2 arms, 36-1, 36-2 extendable units , 40 sign unit, 50 sensing unit, 150 processing unit, 152 position information generation unit, 154 angle information generation unit, 156 adjustment processing unit, 158 angle derivation unit, 190 projection unit, 191 spatial light modulator, 192 projection lens, 194 Zoom unit, 196 Focus unit, 198 Lens shift unit, 500 LCD panel

Claims (8)

A projector that projects an image;
A target portion on which the image projected by the projector is displayed;
A projection system comprising:
The projector or the target unit is
Angle deriving means for deriving a predetermined angle;
Position information generating means for generating position information indicating information on a relative position between the projector and the target unit;
Angle information generating means for generating angle information indicating information on a relative angle between the projector and the target unit;
Based on the position information and the angle information, adjustment of at least one of a correction process of image information used for projecting the image and a control process of a projection unit included in the projector so that the image is displayed in a desired state Adjustment processing means for executing processing;
Including
One of the projector and the target unit is
A first sensing means;
A first marker part, a second marker part provided at a position different from the first marker part,
Have
The other of the projector and the target unit is
A third sign section;
A second sensing means;
Have
The first sensing means generates first sensing information by sensing the vicinity of the third marker,
The second sensing means generates second sensing information by sensing the vicinity of the first marker,
The second sensing means generates third sensing information by sensing the vicinity of the second marker part,
The angle deriving means includes
Based on the first sensing information, a first angle that is a relative angle between the third marker and the first sensing means is derived,
Based on the second sensing information, a second angle that is a relative angle between the first marker and the second sensing means is derived,
Based on the third sensing information, a third angle that is a relative angle between the second marker and the second sensing means is derived,
The position information generating means generates the position information using at least the first to third angles,
The angle information generating means generates the angle information using at least the first to third angles,
The projection system, wherein the position information and the angle information are information defined in a predetermined plane. In claim 1,
The position information generating means generates the position information using a sine theorem of a circumscribed circle in contact with the first to third marker portions based on the first to third angles,
The angle information generation means generates the angle information by deriving an angle formed by the optical axis of the second sensing means and a normal line of the target portion based on the first to third angles. A projection system characterized by that. In any one of Claims 1, 2.
The sign part emits light by light projection or reflection,
The projection system, wherein the angle deriving unit derives the first to third angles based on luminance information and sensing angles included in the first to third sensing information. In any one of Claims 1-3,
A projection system comprising: a support unit that supports the projector and the target unit so that the position information and the angle information are defined within the predetermined plane. In claim 4,
The projection system according to claim 1, wherein the support unit includes an arm unit formed so that a relative position between the projector and the target unit can be changed by an expansion / contraction operation or a rotation operation. In any one of Claims 1-5,
The projection unit includes at least one of a lens shift unit that adjusts the projection position of the image, a zoom unit that adjusts the size of the image, and a focus unit that adjusts the focal position of the image,
The adjustment processing unit controls at least one of the lens shift unit, the zoom unit, and the focus unit as the control processing so that the image is displayed in a desired state. Projection system. In any one of Claims 1-6,
The projection unit includes a spatial light modulator,
The adjustment processing means includes a process of changing an image area in the spatial light modulator and a process of changing a modulation amount in the spatial light modulator as the control process so that the image is displayed in a desired state. A projection system that executes at least one of the processes. A projector that projects an image;
A target portion on which the image projected by the projector is displayed;
A projection adjustment method for a projection system comprising:
One of the projector and the target unit is
A first sensing means;
A first marker part, a second marker part provided at a position different from the first marker part,
Have
The other of the projector and the target unit is
A third sign section;
A second sensing means;
Have
First sensing information is generated by sensing the vicinity of the third marker using the first sensing means,
Second sensing information is generated by sensing the vicinity of the first marker using the second sensing means,
Third sensing information is generated by sensing the vicinity of the second marker using the second sensing means,
Based on the first sensing information, a first angle that is a relative angle between the third marker and the first sensing means is derived,
Based on the second sensing information, a second angle that is a relative angle between the first marker and the second sensing means is derived,
Based on the third sensing information, a third angle that is a relative angle between the second marker and the second sensing means is derived,
Based on the first to third angles, the sine theorem of the circumscribed circle in contact with the first to third marker portions is used to indicate information on the relative position between the projector and the target portion, and within a predetermined plane Generate location information specified in
Based on the first to third angles, a relative angle between the projector and the target unit is derived by deriving an angle between the optical axis of the second sensing unit and the normal line of the target unit. Indicating information, generating angle information defined in the predetermined plane,
Based on the position information and the angle information, adjustment of at least one of a correction process of image information used for projecting the image and a control process of a projection unit included in the projector so that the image is displayed in a desired state A projection adjustment method characterized by executing processing.

Images